# Author: wangjk
# 2025年10月24日13时03分
# xxx@qq.com

everything=[]
everything.append('land')
everything.insert(1,'sea')
everything.insert(2,'sky')
print(everything)
print(len(everything))

everything.append('cat')
everything.append('dog')
everything.append('bird')
print(everything)

everything.pop()
everything.pop(3)
print(everything)
everything.remove('dog')
print(everything)

everything.reverse()
print(everything)
print(sorted(everything))
print(everything)
everything.sort(reverse=False)
print(everything)

print(everything[-2])
